Engine cooling system



May 17, 1960- M. H. FRANK ENGINE COOLING SYSTEM Filed Dec. 31, 1958 l f/ liar-laf, l

2,936,745 ENGINE CGOLING SYSTEM Mark H. Frank, Birmingham, Mich., assiguor to General Motors Corporation, Detroit,.Mich., a corporation of Delaware v f Application December 31, 19758, Serial No. 784,216 1 Claim. (Cl. 12s-41.29)

lluid between an engine and a radiator and including a United States Patent O "ice posed axially of the impeller 19 and adapted to supply #forming a part of the casing 18. An inlet conduit 29 connects the inlet chamber 23 to the lower part of a vradiator 31. l The upper part of the radiator is connected bya conduit 32 and a branch conduit 33 to the coolingV cavities in the cylinder heads14. The discharge champump having annular discharge chambers surrounding the impeller employed in the pump, there being one ofy such discharge chambers for each bank of cylinders of the engine. Each discharge chamber is connected to one bank of cylinders. The single pump inlet is connected .to the radiator of the engine.

In the'drawing: n

Figure l is a lfragmentary view of a cooling system embodying the invention. The cooling system illustrated is embodied in a V-type, 8-cylinderinternal combustion engine for automotive or other'purposes.

Figure 2 is a fragmentary cross-sectional view taken through the axis of the pump Vembodied inthe system illustrated by Figure 1, and in the radial plane of the two discharge chamber outlets for the pump.

Figure 3 is a fragmentary cross-sectional view through one of the cylinder banks and its head and showing theVv v communicating cooling cavities in the head andthe bank. The engine 10 embodying the invention has a' block 11 in which rows or banks of cylinders 12 vand 13 `are formed. Heads 14 are provided for the banks-of cylinders 12 and 13,A there being covers V16 forY the valve ing fluid circulating means embodying a pump 17 is 50 provided for the engine 10. The pump 17 embraces a pump casing`18 .in which an impeller 19 is rotatably mounted on a shaft 21 supported by a bearing 22. The

casing 18 is formed to Vprovide an inlet chamber 23 disber 27 is connected by a conduit 36 to cooling cavities in cylinder kbank 13. A by-pass passage 37 is also connected between the inlet chamber 23 and the branch conduit 33 for returning a portion of cooling fluid to the inlet chamber at all times for the purpose of maintaining coolant'circulation within the engine when the engine thermostat closesl the outlet conduit 32. The impeller 19 may be `driven from the engine in any suitable manner. It will be noted that the divided discharge chambers 26 and 27 provide separate 360 outlets from the impeller 19 and in eiect provide a diierent pump for each of the cylinder banks. However, the same inlet chamber and impeller are employed.

`I claim:

A cooling system for an internal combustion engine having banks of cylinders and a radiator and having means for circulating cooling fluid within and between said radiator and said engine and over said cylinders for cooling said cylinders and comprising, a cooling fluid circulating pump having an impeller with blades having a uniform diameter throughout the axial length of the impeller and a pump casing,vsaid impeller being rotatively mounted in said casing, an inlet chamber formed in said casing at the axis of said impeller, a pair of discharge chambers formed in said casing around the periphery ofsaid impeller, said discharge chambers being annular in formation and disposed in parallel Vplanes.

normal to the axis of rotationrof said impeller and `being separated by a lwall normal tothe axis 'of rotation of said impeller andequally dividing the ,cooling fluid discharged by said impeller, and conduit means connecting each of said discharge chambers to one of said banks Y of cylinders and said inlet chamber to said radiator.

i'. References Cited in the le of this patent UNrraDY STATESy PATENTS Patented May`l7, 1960 

